Table 2.

Adjusted mean changes of primary outcomes (PSS, BDI, IBS.S) by study group before and after the intervention and effect sizes during the study.

Main baseline data (mean ± SD)	Intervention group (24)	Control group (22)	p - value	Effect size
APSS_score	−6.16±4.30	0.50±3.59	<0.001	0.676
ΔBDI_score	−3.75±3.60	0.22±1.50	<0.001	0.687
ΔIBS.S_score	−18.08±8.42	2.68±7.03	<0.001	0.840
ΔHLC1	2.83±2.80	0.86±1.48	0.007	0.394
ΔHLC2	−2.12±2.77	0±2.20	<0.001	0.515
ΔHLC3	−2.45±2.39	−0.27±1.35	<0.001	0.629
ΔBMI	−0.48±0.71	0.11±0.31	<0.001	0.531

Notes: PSS= Perceived Stress Scale, BDI= Beck Depression Inventory, IBS.S = Irritable Bowel Syndrome Symptoms, HLC = Health Locus of Control (1= internal, 2= external, 3= chance), BMI= weight/ height2. Tested by the non-parametric Mann–Whitney U-test. p<0.05.